123220505 has 32 divisors (see below), whose sum is σ = 163565568. Its totient is φ = 88704000.

The previous prime is 123220481. The next prime is 123220541. The reversal of 123220505 is 505022321.

It is not a de Polignac number, because 123220505 - 2²⁴ = 106443289 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265904 + ... + 266366.

It is an arithmetic number, because the mean of its divisors is an integer number (5111424).

Almost surely, 2^123220505 is an apocalyptic number.

It is an amenable number.

123220505 is a deficient number, since it is larger than the sum of its proper divisors (40345063).

123220505 is a wasteful number, since it uses less digits than its factorization.

123220505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 123220505 is about 11100.4731881123. The cubic root of 123220505 is about 497.6159910688.

Adding to 123220505 its reverse (505022321), we get a palindrome (628242826).

The spelling of 123220505 in words is "one hundred twenty-three million, two hundred twenty thousand, five hundred five".